| Texto completo | |
| Autor(es): |
Goncalves, Mayra D.
;
Souza, Flavio L.
;
Longo, Elson
;
Leite, Edson R.
;
Camargo, Emerson R.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CERAMICS INTERNATIONAL; v. 42, n. 13, p. 14423-14430, OCT 2016. |
| Citações Web of Science: | 6 |
| Resumo | |
Highly reactive lead zirconate titanate powders (PZT) with different compositions were successfully synthesized by the oxidant-peroxo method (OPM) and used to prepare dense ceramic samples with composition near to the morphotropic phase boundary (MPB) sintered at 1000 degrees C for 2 h using a tubular conventional oven and a commercial microwave system. Crystalline phases were identified in the powder and ceramic samples by X-ray powder diffraction and FT-Raman spectroscopy at room temperature. The fractured surface of the ceramic sample showed a high degree of densification with fairly uniform grain sizes. Dielectric constants measured in the range from 30 to 500 degrees C at different frequencies (1,10 and 100 kHz) indicated a normal ferroelectric behavior regardless of the sintering method. Samples sintered by a microwave radiation (MW) method and composition near to the MPB region showed a maximum dielectric constant of 17.911 and an anomalous high Curie temperature of 465 degrees C. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU) | |
| Processo FAPESP: | 09/01587-0 - Perovskitas baseadas no PZT modificadas com terras raras sintetizadas usando o método dos complexos oxidantes de peróxido (OPM) e caracterizadas com uso complementar de espectroscopia Raman, difração de raios-X e microscopia eletrônica. |
| Beneficiário: | Mayra Dancini Gonçalves |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 07/50904-2 - Perovskitas baseadas no titanato de chumbo modificadas com terras raras sintetizadas usando o método dos complexos oxidantes de peróxido (OPM - the oxidant-peroxide method) e caracterizadas com uso complementar de espectroscopia Raman, infravermelho e difração de raios X |
| Beneficiário: | Alexandre Henrique Pinto |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |